[INFO] updating cached repository https://github.com/Cackbone/2048.rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9c58e9f2ea5fb12a56dd27087d6b618184fc8c6f
[INFO] testing Cackbone/2048.rs against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FCackbone%2F2048.rs" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Cackbone/2048.rs on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Cackbone/2048.rs
[INFO] finished tweaking git repo https://github.com/Cackbone/2048.rs
[INFO] tweaked toml for git repo https://github.com/Cackbone/2048.rs written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/Cackbone/2048.rs already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 41d347a381e8bc30b2b19317e72e47a313c3b7464a7977c6b4422368bd2eb8bf
[INFO] running `"docker" "start" "-a" "41d347a381e8bc30b2b19317e72e47a313c3b7464a7977c6b4422368bd2eb8bf"`
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling rust_2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/main.rs:189:25
[INFO] [stderr]     |
[INFO] [stderr] 189 |         print_line('-');;
[INFO] [stderr]     |                         ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolon)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `grid_bis` is never read
[INFO] [stderr]   --> src/main.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
[INFO] [stderr]    |             ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:97:28
[INFO] [stderr]    |
[INFO] [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
[INFO] [stderr]    |                            ----^^^^
[INFO] [stderr]    |                            |
[INFO] [stderr]    |                            help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:137:13
[INFO] [stderr]     |
[INFO] [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:52:13
[INFO] [stderr]    |
[INFO] [stderr] 52 |             Command::new("clear").status();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     Command::new("clear").status();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.19s
[INFO] running `"docker" "inspect" "41d347a381e8bc30b2b19317e72e47a313c3b7464a7977c6b4422368bd2eb8bf"`
[INFO] running `"docker" "rm" "-f" "41d347a381e8bc30b2b19317e72e47a313c3b7464a7977c6b4422368bd2eb8bf"`
[INFO] [stdout] 41d347a381e8bc30b2b19317e72e47a313c3b7464a7977c6b4422368bd2eb8bf
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen" "--no-run"`
[INFO] [stdout] d787a38bbddd6bb8f6d4da2d76705c2d2a09a5ed1046dc6808080e4aa259501c
[INFO] running `"docker" "start" "-a" "d787a38bbddd6bb8f6d4da2d76705c2d2a09a5ed1046dc6808080e4aa259501c"`
[INFO] [stderr]    Compiling rust_2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/main.rs:189:25
[INFO] [stderr]     |
[INFO] [stderr] 189 |         print_line('-');;
[INFO] [stderr]     |                         ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolon)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `grid_bis` is never read
[INFO] [stderr]   --> src/main.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
[INFO] [stderr]    |             ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:97:28
[INFO] [stderr]    |
[INFO] [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
[INFO] [stderr]    |                            ----^^^^
[INFO] [stderr]    |                            |
[INFO] [stderr]    |                            help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:137:13
[INFO] [stderr]     |
[INFO] [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:52:13
[INFO] [stderr]    |
[INFO] [stderr] 52 |             Command::new("clear").status();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     Command::new("clear").status();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `"docker" "inspect" "d787a38bbddd6bb8f6d4da2d76705c2d2a09a5ed1046dc6808080e4aa259501c"`
[INFO] running `"docker" "rm" "-f" "d787a38bbddd6bb8f6d4da2d76705c2d2a09a5ed1046dc6808080e4aa259501c"`
[INFO] [stdout] d787a38bbddd6bb8f6d4da2d76705c2d2a09a5ed1046dc6808080e4aa259501c
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen"`
[INFO] [stdout] 877762ad5543a835ce5fe997a41f35f680d0cf6659bf715a1023a3f49d4fdeaa
[INFO] running `"docker" "start" "-a" "877762ad5543a835ce5fe997a41f35f680d0cf6659bf715a1023a3f49d4fdeaa"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_2048-ff8020bb0a4744d1
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "877762ad5543a835ce5fe997a41f35f680d0cf6659bf715a1023a3f49d4fdeaa"`
[INFO] running `"docker" "rm" "-f" "877762ad5543a835ce5fe997a41f35f680d0cf6659bf715a1023a3f49d4fdeaa"`
[INFO] [stdout] 877762ad5543a835ce5fe997a41f35f680d0cf6659bf715a1023a3f49d4fdeaa